Decryption Vigenere Cipher
I am going crazy with this decryption. I ve done a lot of research but seems I don't what I am doing . Any suggestion where to start ? Thank you
Find the 6-letter key and the plain text (decrypted) text for the following encrypted stream. And it uses Vigenere Square but does use a 6-letter word as key.
XBO TXH GL PHQHQBZD MV HBB T ZDFVL XBFOFM BR RHYQGI FFNAL